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1/*
2 * vio driver interface to hvc_console.c
3 *
4 * This code was moved here to allow the remaining code to be reused as a
5 * generic polling mode with semi-reliable transport driver core to the
6 * console and tty subsystems.
7 *
8 *
9 * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
10 * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
11 * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
12 * Copyright (C) 2004 IBM Corporation
13 *
14 * Additional Author(s):
15 * Ryan S. Arnold <rsa@us.ibm.com>
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
21 *
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 *
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 *
31 * TODO:
32 *
33 * - handle error in sending hvsi protocol packets
34 * - retry nego on subsequent sends ?
35 */
36
37#undef DEBUG
38
39#include <linux/types.h>
40#include <linux/init.h>
41#include <linux/delay.h>
42#include <linux/slab.h>
43#include <linux/console.h>
44
45#include <asm/hvconsole.h>
46#include <asm/vio.h>
47#include <asm/prom.h>
48#include <asm/firmware.h>
49#include <asm/hvsi.h>
50#include <asm/udbg.h>
51
52#include "hvc_console.h"
53
54static const char hvc_driver_name[] = "hvc_console";
55
56static struct vio_device_id hvc_driver_table[] __devinitdata = {
57 {"serial", "hvterm1"},
58#ifndef HVC_OLD_HVSI
59 {"serial", "hvterm-protocol"},
60#endif
61 { "", "" }
62};
63MODULE_DEVICE_TABLE(vio, hvc_driver_table);
64
65typedef enum hv_protocol {
66 HV_PROTOCOL_RAW,
67 HV_PROTOCOL_HVSI
68} hv_protocol_t;
69
70struct hvterm_priv {
71 u32 termno; /* HV term number */
72 hv_protocol_t proto; /* Raw data or HVSI packets */
73 struct hvsi_priv hvsi; /* HVSI specific data */
74 spinlock_t buf_lock;
75 char buf[SIZE_VIO_GET_CHARS];
76 int left;
77 int offset;
78};
79static struct hvterm_priv *hvterm_privs[MAX_NR_HVC_CONSOLES];
80/* For early boot console */
81static struct hvterm_priv hvterm_priv0;
82
83static int hvterm_raw_get_chars(uint32_t vtermno, char *buf, int count)
84{
85 struct hvterm_priv *pv = hvterm_privs[vtermno];
86 unsigned long i;
87 unsigned long flags;
88 int got;
89
90 if (WARN_ON(!pv))
91 return 0;
92
93 spin_lock_irqsave(&pv->buf_lock, flags);
94
95 if (pv->left == 0) {
96 pv->offset = 0;
97 pv->left = hvc_get_chars(pv->termno, pv->buf, count);
98
99 /*
100 * Work around a HV bug where it gives us a null
101 * after every \r. -- paulus
102 */
103 for (i = 1; i < pv->left; ++i) {
104 if (pv->buf[i] == 0 && pv->buf[i-1] == '\r') {
105 --pv->left;
106 if (i < pv->left) {
107 memmove(&pv->buf[i], &pv->buf[i+1],
108 pv->left - i);
109 }
110 }
111 }
112 }
113
114 got = min(count, pv->left);
115 memcpy(buf, &pv->buf[pv->offset], got);
116 pv->offset += got;
117 pv->left -= got;
118
119 spin_unlock_irqrestore(&pv->buf_lock, flags);
120
121 return got;
122}
123
124static int hvterm_raw_put_chars(uint32_t vtermno, const char *buf, int count)
125{
126 struct hvterm_priv *pv = hvterm_privs[vtermno];
127
128 if (WARN_ON(!pv))
129 return 0;
130
131 return hvc_put_chars(pv->termno, buf, count);
132}
133
134static const struct hv_ops hvterm_raw_ops = {
135 .get_chars = hvterm_raw_get_chars,
136 .put_chars = hvterm_raw_put_chars,
137 .notifier_add = notifier_add_irq,
138 .notifier_del = notifier_del_irq,
139 .notifier_hangup = notifier_hangup_irq,
140};
141
142static int hvterm_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
143{
144 struct hvterm_priv *pv = hvterm_privs[vtermno];
145
146 if (WARN_ON(!pv))
147 return 0;
148
149 return hvsilib_get_chars(&pv->hvsi, buf, count);
150}
151
152static int hvterm_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
153{
154 struct hvterm_priv *pv = hvterm_privs[vtermno];
155
156 if (WARN_ON(!pv))
157 return 0;
158
159 return hvsilib_put_chars(&pv->hvsi, buf, count);
160}
161
162static int hvterm_hvsi_open(struct hvc_struct *hp, int data)
163{
164 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
165 int rc;
166
167 pr_devel("HVSI@%x: open !\n", pv->termno);
168
169 rc = notifier_add_irq(hp, data);
170 if (rc)
171 return rc;
172
173 return hvsilib_open(&pv->hvsi, hp);
174}
175
176static void hvterm_hvsi_close(struct hvc_struct *hp, int data)
177{
178 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
179
180 pr_devel("HVSI@%x: do close !\n", pv->termno);
181
182 hvsilib_close(&pv->hvsi, hp);
183
184 notifier_del_irq(hp, data);
185}
186
187void hvterm_hvsi_hangup(struct hvc_struct *hp, int data)
188{
189 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
190
191 pr_devel("HVSI@%x: do hangup !\n", pv->termno);
192
193 hvsilib_close(&pv->hvsi, hp);
194
195 notifier_hangup_irq(hp, data);
196}
197
198static int hvterm_hvsi_tiocmget(struct hvc_struct *hp)
199{
200 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
201
202 if (!pv)
203 return -EINVAL;
204 return pv->hvsi.mctrl;
205}
206
207static int hvterm_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
208 unsigned int clear)
209{
210 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
211
212 pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
213 pv->termno, set, clear);
214
215 if (set & TIOCM_DTR)
216 hvsilib_write_mctrl(&pv->hvsi, 1);
217 else if (clear & TIOCM_DTR)
218 hvsilib_write_mctrl(&pv->hvsi, 0);
219
220 return 0;
221}
222
223static const struct hv_ops hvterm_hvsi_ops = {
224 .get_chars = hvterm_hvsi_get_chars,
225 .put_chars = hvterm_hvsi_put_chars,
226 .notifier_add = hvterm_hvsi_open,
227 .notifier_del = hvterm_hvsi_close,
228 .notifier_hangup = hvterm_hvsi_hangup,
229 .tiocmget = hvterm_hvsi_tiocmget,
230 .tiocmset = hvterm_hvsi_tiocmset,
231};
232
233static int __devinit hvc_vio_probe(struct vio_dev *vdev,
234 const struct vio_device_id *id)
235{
236 const struct hv_ops *ops;
237 struct hvc_struct *hp;
238 struct hvterm_priv *pv;
239 hv_protocol_t proto;
240 int i, termno = -1;
241
242 /* probed with invalid parameters. */
243 if (!vdev || !id)
244 return -EPERM;
245
246 if (of_device_is_compatible(vdev->dev.of_node, "hvterm1")) {
247 proto = HV_PROTOCOL_RAW;
248 ops = &hvterm_raw_ops;
249 } else if (of_device_is_compatible(vdev->dev.of_node, "hvterm-protocol")) {
250 proto = HV_PROTOCOL_HVSI;
251 ops = &hvterm_hvsi_ops;
252 } else {
253 pr_err("hvc_vio: Unkown protocol for %s\n", vdev->dev.of_node->full_name);
254 return -ENXIO;
255 }
256
257 pr_devel("hvc_vio_probe() device %s, using %s protocol\n",
258 vdev->dev.of_node->full_name,
259 proto == HV_PROTOCOL_RAW ? "raw" : "hvsi");
260
261 /* Is it our boot one ? */
262 if (hvterm_privs[0] == &hvterm_priv0 &&
263 vdev->unit_address == hvterm_priv0.termno) {
264 pv = hvterm_privs[0];
265 termno = 0;
266 pr_devel("->boot console, using termno 0\n");
267 }
268 /* nope, allocate a new one */
269 else {
270 for (i = 0; i < MAX_NR_HVC_CONSOLES && termno < 0; i++)
271 if (!hvterm_privs[i])
272 termno = i;
273 pr_devel("->non-boot console, using termno %d\n", termno);
274 if (termno < 0)
275 return -ENODEV;
276 pv = kzalloc(sizeof(struct hvterm_priv), GFP_KERNEL);
277 if (!pv)
278 return -ENOMEM;
279 pv->termno = vdev->unit_address;
280 pv->proto = proto;
281 spin_lock_init(&pv->buf_lock);
282 hvterm_privs[termno] = pv;
283 hvsilib_init(&pv->hvsi, hvc_get_chars, hvc_put_chars,
284 pv->termno, 0);
285 }
286
287 hp = hvc_alloc(termno, vdev->irq, ops, MAX_VIO_PUT_CHARS);
288 if (IS_ERR(hp))
289 return PTR_ERR(hp);
290 dev_set_drvdata(&vdev->dev, hp);
291
292 return 0;
293}
294
295static int __devexit hvc_vio_remove(struct vio_dev *vdev)
296{
297 struct hvc_struct *hp = dev_get_drvdata(&vdev->dev);
298 int rc, termno;
299
300 termno = hp->vtermno;
301 rc = hvc_remove(hp);
302 if (rc == 0) {
303 if (hvterm_privs[termno] != &hvterm_priv0)
304 kfree(hvterm_privs[termno]);
305 hvterm_privs[termno] = NULL;
306 }
307 return rc;
308}
309
310static struct vio_driver hvc_vio_driver = {
311 .id_table = hvc_driver_table,
312 .probe = hvc_vio_probe,
313 .remove = __devexit_p(hvc_vio_remove),
314 .driver = {
315 .name = hvc_driver_name,
316 .owner = THIS_MODULE,
317 }
318};
319
320static int __init hvc_vio_init(void)
321{
322 int rc;
323
324 if (firmware_has_feature(FW_FEATURE_ISERIES))
325 return -EIO;
326
327 /* Register as a vio device to receive callbacks */
328 rc = vio_register_driver(&hvc_vio_driver);
329
330 return rc;
331}
332module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
333
334static void __exit hvc_vio_exit(void)
335{
336 vio_unregister_driver(&hvc_vio_driver);
337}
338module_exit(hvc_vio_exit);
339
340static void udbg_hvc_putc(char c)
341{
342 int count = -1;
343
344 if (c == '\n')
345 udbg_hvc_putc('\r');
346
347 do {
348 switch(hvterm_priv0.proto) {
349 case HV_PROTOCOL_RAW:
350 count = hvterm_raw_put_chars(0, &c, 1);
351 break;
352 case HV_PROTOCOL_HVSI:
353 count = hvterm_hvsi_put_chars(0, &c, 1);
354 break;
355 }
356 } while(count == 0);
357}
358
359static int udbg_hvc_getc_poll(void)
360{
361 int rc = 0;
362 char c;
363
364 switch(hvterm_priv0.proto) {
365 case HV_PROTOCOL_RAW:
366 rc = hvterm_raw_get_chars(0, &c, 1);
367 break;
368 case HV_PROTOCOL_HVSI:
369 rc = hvterm_hvsi_get_chars(0, &c, 1);
370 break;
371 }
372 if (!rc)
373 return -1;
374 return c;
375}
376
377static int udbg_hvc_getc(void)
378{
379 int ch;
380 for (;;) {
381 ch = udbg_hvc_getc_poll();
382 if (ch == -1) {
383 /* This shouldn't be needed...but... */
384 volatile unsigned long delay;
385 for (delay=0; delay < 2000000; delay++)
386 ;
387 } else {
388 return ch;
389 }
390 }
391}
392
393void __init hvc_vio_init_early(void)
394{
395 struct device_node *stdout_node;
396 const u32 *termno;
397 const char *name;
398 const struct hv_ops *ops;
399
400 /* find the boot console from /chosen/stdout */
401 if (!of_chosen)
402 return;
403 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
404 if (name == NULL)
405 return;
406 stdout_node = of_find_node_by_path(name);
407 if (!stdout_node)
408 return;
409 name = of_get_property(stdout_node, "name", NULL);
410 if (!name) {
411 printk(KERN_WARNING "stdout node missing 'name' property!\n");
412 goto out;
413 }
414
415 /* Check if it's a virtual terminal */
416 if (strncmp(name, "vty", 3) != 0)
417 goto out;
418 termno = of_get_property(stdout_node, "reg", NULL);
419 if (termno == NULL)
420 goto out;
421 hvterm_priv0.termno = *termno;
422 spin_lock_init(&hvterm_priv0.buf_lock);
423 hvterm_privs[0] = &hvterm_priv0;
424
425 /* Check the protocol */
426 if (of_device_is_compatible(stdout_node, "hvterm1")) {
427 hvterm_priv0.proto = HV_PROTOCOL_RAW;
428 ops = &hvterm_raw_ops;
429 }
430 else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) {
431 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
432 ops = &hvterm_hvsi_ops;
433 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
434 hvterm_priv0.termno, 1);
435 /* HVSI, perform the handshake now */
436 hvsilib_establish(&hvterm_priv0.hvsi);
437 } else
438 goto out;
439 udbg_putc = udbg_hvc_putc;
440 udbg_getc = udbg_hvc_getc;
441 udbg_getc_poll = udbg_hvc_getc_poll;
442#ifdef HVC_OLD_HVSI
443 /* When using the old HVSI driver don't register the HVC
444 * backend for HVSI, only do udbg
445 */
446 if (hvterm_priv0.proto == HV_PROTOCOL_HVSI)
447 goto out;
448#endif
449 add_preferred_console("hvc", 0, NULL);
450 hvc_instantiate(0, 0, ops);
451out:
452 of_node_put(stdout_node);
453}
454
455/* call this from early_init() for a working debug console on
456 * vterm capable LPAR machines
457 */
458#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR
459void __init udbg_init_debug_lpar(void)
460{
461 hvterm_privs[0] = &hvterm_priv0;
462 hvterm_priv0.termno = 0;
463 hvterm_priv0.proto = HV_PROTOCOL_RAW;
464 spin_lock_init(&hvterm_priv0.buf_lock);
465 udbg_putc = udbg_hvc_putc;
466 udbg_getc = udbg_hvc_getc;
467 udbg_getc_poll = udbg_hvc_getc_poll;
468}
469#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR */
470
471#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI
472void __init udbg_init_debug_lpar_hvsi(void)
473{
474 hvterm_privs[0] = &hvterm_priv0;
475 hvterm_priv0.termno = CONFIG_PPC_EARLY_DEBUG_HVSI_VTERMNO;
476 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
477 spin_lock_init(&hvterm_priv0.buf_lock);
478 udbg_putc = udbg_hvc_putc;
479 udbg_getc = udbg_hvc_getc;
480 udbg_getc_poll = udbg_hvc_getc_poll;
481 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
482 hvterm_priv0.termno, 1);
483 hvsilib_establish(&hvterm_priv0.hvsi);
484}
485#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI */
1/*
2 * vio driver interface to hvc_console.c
3 *
4 * This code was moved here to allow the remaining code to be reused as a
5 * generic polling mode with semi-reliable transport driver core to the
6 * console and tty subsystems.
7 *
8 *
9 * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
10 * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
11 * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
12 * Copyright (C) 2004 IBM Corporation
13 *
14 * Additional Author(s):
15 * Ryan S. Arnold <rsa@us.ibm.com>
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
21 *
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 *
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 *
31 * TODO:
32 *
33 * - handle error in sending hvsi protocol packets
34 * - retry nego on subsequent sends ?
35 */
36
37#undef DEBUG
38
39#include <linux/types.h>
40#include <linux/init.h>
41#include <linux/delay.h>
42#include <linux/slab.h>
43#include <linux/console.h>
44#include <linux/module.h>
45
46#include <asm/hvconsole.h>
47#include <asm/vio.h>
48#include <asm/prom.h>
49#include <asm/hvsi.h>
50#include <asm/udbg.h>
51#include <asm/machdep.h>
52
53#include "hvc_console.h"
54
55static const char hvc_driver_name[] = "hvc_console";
56
57static struct vio_device_id hvc_driver_table[] = {
58 {"serial", "hvterm1"},
59#ifndef HVC_OLD_HVSI
60 {"serial", "hvterm-protocol"},
61#endif
62 { "", "" }
63};
64MODULE_DEVICE_TABLE(vio, hvc_driver_table);
65
66typedef enum hv_protocol {
67 HV_PROTOCOL_RAW,
68 HV_PROTOCOL_HVSI
69} hv_protocol_t;
70
71struct hvterm_priv {
72 u32 termno; /* HV term number */
73 hv_protocol_t proto; /* Raw data or HVSI packets */
74 struct hvsi_priv hvsi; /* HVSI specific data */
75 spinlock_t buf_lock;
76 char buf[SIZE_VIO_GET_CHARS];
77 int left;
78 int offset;
79};
80static struct hvterm_priv *hvterm_privs[MAX_NR_HVC_CONSOLES];
81/* For early boot console */
82static struct hvterm_priv hvterm_priv0;
83
84static int hvterm_raw_get_chars(uint32_t vtermno, char *buf, int count)
85{
86 struct hvterm_priv *pv = hvterm_privs[vtermno];
87 unsigned long i;
88 unsigned long flags;
89 int got;
90
91 if (WARN_ON(!pv))
92 return 0;
93
94 spin_lock_irqsave(&pv->buf_lock, flags);
95
96 if (pv->left == 0) {
97 pv->offset = 0;
98 pv->left = hvc_get_chars(pv->termno, pv->buf, count);
99
100 /*
101 * Work around a HV bug where it gives us a null
102 * after every \r. -- paulus
103 */
104 for (i = 1; i < pv->left; ++i) {
105 if (pv->buf[i] == 0 && pv->buf[i-1] == '\r') {
106 --pv->left;
107 if (i < pv->left) {
108 memmove(&pv->buf[i], &pv->buf[i+1],
109 pv->left - i);
110 }
111 }
112 }
113 }
114
115 got = min(count, pv->left);
116 memcpy(buf, &pv->buf[pv->offset], got);
117 pv->offset += got;
118 pv->left -= got;
119
120 spin_unlock_irqrestore(&pv->buf_lock, flags);
121
122 return got;
123}
124
125static int hvterm_raw_put_chars(uint32_t vtermno, const char *buf, int count)
126{
127 struct hvterm_priv *pv = hvterm_privs[vtermno];
128
129 if (WARN_ON(!pv))
130 return 0;
131
132 return hvc_put_chars(pv->termno, buf, count);
133}
134
135static const struct hv_ops hvterm_raw_ops = {
136 .get_chars = hvterm_raw_get_chars,
137 .put_chars = hvterm_raw_put_chars,
138 .notifier_add = notifier_add_irq,
139 .notifier_del = notifier_del_irq,
140 .notifier_hangup = notifier_hangup_irq,
141};
142
143static int hvterm_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
144{
145 struct hvterm_priv *pv = hvterm_privs[vtermno];
146
147 if (WARN_ON(!pv))
148 return 0;
149
150 return hvsilib_get_chars(&pv->hvsi, buf, count);
151}
152
153static int hvterm_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
154{
155 struct hvterm_priv *pv = hvterm_privs[vtermno];
156
157 if (WARN_ON(!pv))
158 return 0;
159
160 return hvsilib_put_chars(&pv->hvsi, buf, count);
161}
162
163static int hvterm_hvsi_open(struct hvc_struct *hp, int data)
164{
165 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
166 int rc;
167
168 pr_devel("HVSI@%x: open !\n", pv->termno);
169
170 rc = notifier_add_irq(hp, data);
171 if (rc)
172 return rc;
173
174 return hvsilib_open(&pv->hvsi, hp);
175}
176
177static void hvterm_hvsi_close(struct hvc_struct *hp, int data)
178{
179 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
180
181 pr_devel("HVSI@%x: do close !\n", pv->termno);
182
183 hvsilib_close(&pv->hvsi, hp);
184
185 notifier_del_irq(hp, data);
186}
187
188void hvterm_hvsi_hangup(struct hvc_struct *hp, int data)
189{
190 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
191
192 pr_devel("HVSI@%x: do hangup !\n", pv->termno);
193
194 hvsilib_close(&pv->hvsi, hp);
195
196 notifier_hangup_irq(hp, data);
197}
198
199static int hvterm_hvsi_tiocmget(struct hvc_struct *hp)
200{
201 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
202
203 if (!pv)
204 return -EINVAL;
205 return pv->hvsi.mctrl;
206}
207
208static int hvterm_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
209 unsigned int clear)
210{
211 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
212
213 pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
214 pv->termno, set, clear);
215
216 if (set & TIOCM_DTR)
217 hvsilib_write_mctrl(&pv->hvsi, 1);
218 else if (clear & TIOCM_DTR)
219 hvsilib_write_mctrl(&pv->hvsi, 0);
220
221 return 0;
222}
223
224static const struct hv_ops hvterm_hvsi_ops = {
225 .get_chars = hvterm_hvsi_get_chars,
226 .put_chars = hvterm_hvsi_put_chars,
227 .notifier_add = hvterm_hvsi_open,
228 .notifier_del = hvterm_hvsi_close,
229 .notifier_hangup = hvterm_hvsi_hangup,
230 .tiocmget = hvterm_hvsi_tiocmget,
231 .tiocmset = hvterm_hvsi_tiocmset,
232};
233
234static void udbg_hvc_putc(char c)
235{
236 int count = -1;
237
238 if (!hvterm_privs[0])
239 return;
240
241 if (c == '\n')
242 udbg_hvc_putc('\r');
243
244 do {
245 switch(hvterm_privs[0]->proto) {
246 case HV_PROTOCOL_RAW:
247 count = hvterm_raw_put_chars(0, &c, 1);
248 break;
249 case HV_PROTOCOL_HVSI:
250 count = hvterm_hvsi_put_chars(0, &c, 1);
251 break;
252 }
253 } while(count == 0);
254}
255
256static int udbg_hvc_getc_poll(void)
257{
258 int rc = 0;
259 char c;
260
261 if (!hvterm_privs[0])
262 return -1;
263
264 switch(hvterm_privs[0]->proto) {
265 case HV_PROTOCOL_RAW:
266 rc = hvterm_raw_get_chars(0, &c, 1);
267 break;
268 case HV_PROTOCOL_HVSI:
269 rc = hvterm_hvsi_get_chars(0, &c, 1);
270 break;
271 }
272 if (!rc)
273 return -1;
274 return c;
275}
276
277static int udbg_hvc_getc(void)
278{
279 int ch;
280
281 if (!hvterm_privs[0])
282 return -1;
283
284 for (;;) {
285 ch = udbg_hvc_getc_poll();
286 if (ch == -1) {
287 /* This shouldn't be needed...but... */
288 volatile unsigned long delay;
289 for (delay=0; delay < 2000000; delay++)
290 ;
291 } else {
292 return ch;
293 }
294 }
295}
296
297static int hvc_vio_probe(struct vio_dev *vdev,
298 const struct vio_device_id *id)
299{
300 const struct hv_ops *ops;
301 struct hvc_struct *hp;
302 struct hvterm_priv *pv;
303 hv_protocol_t proto;
304 int i, termno = -1;
305
306 /* probed with invalid parameters. */
307 if (!vdev || !id)
308 return -EPERM;
309
310 if (of_device_is_compatible(vdev->dev.of_node, "hvterm1")) {
311 proto = HV_PROTOCOL_RAW;
312 ops = &hvterm_raw_ops;
313 } else if (of_device_is_compatible(vdev->dev.of_node, "hvterm-protocol")) {
314 proto = HV_PROTOCOL_HVSI;
315 ops = &hvterm_hvsi_ops;
316 } else {
317 pr_err("hvc_vio: Unknown protocol for %s\n", vdev->dev.of_node->full_name);
318 return -ENXIO;
319 }
320
321 pr_devel("hvc_vio_probe() device %s, using %s protocol\n",
322 vdev->dev.of_node->full_name,
323 proto == HV_PROTOCOL_RAW ? "raw" : "hvsi");
324
325 /* Is it our boot one ? */
326 if (hvterm_privs[0] == &hvterm_priv0 &&
327 vdev->unit_address == hvterm_priv0.termno) {
328 pv = hvterm_privs[0];
329 termno = 0;
330 pr_devel("->boot console, using termno 0\n");
331 }
332 /* nope, allocate a new one */
333 else {
334 for (i = 0; i < MAX_NR_HVC_CONSOLES && termno < 0; i++)
335 if (!hvterm_privs[i])
336 termno = i;
337 pr_devel("->non-boot console, using termno %d\n", termno);
338 if (termno < 0)
339 return -ENODEV;
340 pv = kzalloc(sizeof(struct hvterm_priv), GFP_KERNEL);
341 if (!pv)
342 return -ENOMEM;
343 pv->termno = vdev->unit_address;
344 pv->proto = proto;
345 spin_lock_init(&pv->buf_lock);
346 hvterm_privs[termno] = pv;
347 hvsilib_init(&pv->hvsi, hvc_get_chars, hvc_put_chars,
348 pv->termno, 0);
349 }
350
351 hp = hvc_alloc(termno, vdev->irq, ops, MAX_VIO_PUT_CHARS);
352 if (IS_ERR(hp))
353 return PTR_ERR(hp);
354 dev_set_drvdata(&vdev->dev, hp);
355
356 /* register udbg if it's not there already for console 0 */
357 if (hp->index == 0 && !udbg_putc) {
358 udbg_putc = udbg_hvc_putc;
359 udbg_getc = udbg_hvc_getc;
360 udbg_getc_poll = udbg_hvc_getc_poll;
361 }
362
363 return 0;
364}
365
366static int hvc_vio_remove(struct vio_dev *vdev)
367{
368 struct hvc_struct *hp = dev_get_drvdata(&vdev->dev);
369 int rc, termno;
370
371 termno = hp->vtermno;
372 rc = hvc_remove(hp);
373 if (rc == 0) {
374 if (hvterm_privs[termno] != &hvterm_priv0)
375 kfree(hvterm_privs[termno]);
376 hvterm_privs[termno] = NULL;
377 }
378 return rc;
379}
380
381static struct vio_driver hvc_vio_driver = {
382 .id_table = hvc_driver_table,
383 .probe = hvc_vio_probe,
384 .remove = hvc_vio_remove,
385 .name = hvc_driver_name,
386};
387
388static int __init hvc_vio_init(void)
389{
390 int rc;
391
392 /* Register as a vio device to receive callbacks */
393 rc = vio_register_driver(&hvc_vio_driver);
394
395 return rc;
396}
397module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
398
399static void __exit hvc_vio_exit(void)
400{
401 vio_unregister_driver(&hvc_vio_driver);
402}
403module_exit(hvc_vio_exit);
404
405void __init hvc_vio_init_early(void)
406{
407 struct device_node *stdout_node;
408 const __be32 *termno;
409 const char *name;
410 const struct hv_ops *ops;
411
412 /* find the boot console from /chosen/stdout */
413 if (!of_chosen)
414 return;
415 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
416 if (name == NULL)
417 return;
418 stdout_node = of_find_node_by_path(name);
419 if (!stdout_node)
420 return;
421 name = of_get_property(stdout_node, "name", NULL);
422 if (!name) {
423 printk(KERN_WARNING "stdout node missing 'name' property!\n");
424 goto out;
425 }
426
427 /* Check if it's a virtual terminal */
428 if (strncmp(name, "vty", 3) != 0)
429 goto out;
430 termno = of_get_property(stdout_node, "reg", NULL);
431 if (termno == NULL)
432 goto out;
433 hvterm_priv0.termno = of_read_number(termno, 1);
434 spin_lock_init(&hvterm_priv0.buf_lock);
435 hvterm_privs[0] = &hvterm_priv0;
436
437 /* Check the protocol */
438 if (of_device_is_compatible(stdout_node, "hvterm1")) {
439 hvterm_priv0.proto = HV_PROTOCOL_RAW;
440 ops = &hvterm_raw_ops;
441 }
442 else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) {
443 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
444 ops = &hvterm_hvsi_ops;
445 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
446 hvterm_priv0.termno, 1);
447 /* HVSI, perform the handshake now */
448 hvsilib_establish(&hvterm_priv0.hvsi);
449 } else
450 goto out;
451 udbg_putc = udbg_hvc_putc;
452 udbg_getc = udbg_hvc_getc;
453 udbg_getc_poll = udbg_hvc_getc_poll;
454#ifdef HVC_OLD_HVSI
455 /* When using the old HVSI driver don't register the HVC
456 * backend for HVSI, only do udbg
457 */
458 if (hvterm_priv0.proto == HV_PROTOCOL_HVSI)
459 goto out;
460#endif
461 /* Check whether the user has requested a different console. */
462 if (!strstr(cmd_line, "console="))
463 add_preferred_console("hvc", 0, NULL);
464 hvc_instantiate(0, 0, ops);
465out:
466 of_node_put(stdout_node);
467}
468
469/* call this from early_init() for a working debug console on
470 * vterm capable LPAR machines
471 */
472#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR
473void __init udbg_init_debug_lpar(void)
474{
475 hvterm_privs[0] = &hvterm_priv0;
476 hvterm_priv0.termno = 0;
477 hvterm_priv0.proto = HV_PROTOCOL_RAW;
478 spin_lock_init(&hvterm_priv0.buf_lock);
479 udbg_putc = udbg_hvc_putc;
480 udbg_getc = udbg_hvc_getc;
481 udbg_getc_poll = udbg_hvc_getc_poll;
482}
483#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR */
484
485#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI
486void __init udbg_init_debug_lpar_hvsi(void)
487{
488 hvterm_privs[0] = &hvterm_priv0;
489 hvterm_priv0.termno = CONFIG_PPC_EARLY_DEBUG_HVSI_VTERMNO;
490 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
491 spin_lock_init(&hvterm_priv0.buf_lock);
492 udbg_putc = udbg_hvc_putc;
493 udbg_getc = udbg_hvc_getc;
494 udbg_getc_poll = udbg_hvc_getc_poll;
495 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
496 hvterm_priv0.termno, 1);
497 hvsilib_establish(&hvterm_priv0.hvsi);
498}
499#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI */